Signaling system and apparatus



Dec. 2 7, 192 '7.

A. F. F. GILSON SIGNALING SYSTEM AND APPARATUS Patented Dec. 27, 1927.V

UNITED STATES PATENT OFFICE.

ALBERT F. F. GILSON, F ORADELL, NEW' JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, NCORPORATED, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

SIGNALING SYSTEM AED APARATUS.

Application filed May 28, 1923.` Serial No. 641,809.

This invention relates to signaling sys tems and apparatus, and more particularly to a unitary structure of a loud speaking receiver and amplifier set..k

An kobject of the invention is the arrangement of a loud speaker horn and an electron discharge ampliiier set in a compact` form.

The invention, according to itspretferred embodiment, provides compactly arranged in a cabinet yet 'easily accessible, a loudL speaker horn, at the rear ot which and forming a part oit the cabinet, is located a panel carrying ampliiier apparatus which is arranged to occupy the space on either side of the horn. In order to facilitate the control ot the apparatus, suitable control devices are arrangedl on the `front of the cabinet. e t' A better understanding ot the invention may be had from the following description,

Vtaken in conjunction with the accompanying drawings wherein Fig. 1 is a iront elevation of the cabinet. F ig. 2 is a rear elevation of the cabinet. Fig. 3 shows the rear interior of the cabinet. Fig. 4 is a horizontal sectional view. Fig. 5 shows the interior ot' the cabinet with the panel removed, while llig. 6 shows diagrammatically the circuit arrangement oft the various parts of the apparatus.

Referring now to the drawings, there is shown a wooden cabinet having in the front thereof a lattice work 5, on the back of which is secured a netting 6 tor preventing the entranceot foreign substances into the interior of the cabinet. Hinged to the rear ot' the cabinet are a pair ot doors'7-f7,

each having apertures 8, the purpose o whichwill be more clearly described hereinafter.

Arranged .on `the inside of the cabinet 4 is a. folded wooden horn 10 in which the progressive increase in lcross-sectional area follows `the exponential law. Specically, thisl feature contemplates ahorn tapered such that the areas ot successive wave fronts increaseiby a constantV per cent per unit of length.` The characteristics of such a horn are clearly set forth in a. copending applica.- tion to H. C. Harrison, Serial No. 628,168, tiled March 28, 1923, and since the horn .structureper se does not forma part 03E the present invention, a detailed description thereof is believed unnecessary. p

Mounted at the rear of the horn 10 and 112 and a iilament switch 30.

within the cabinet 4; is a panel 12 which is secured by means ot suitable screws to uprights 13 and 14 mounted on each side of the cabinet, and carries the apparatus comprising the amplifier set.

Referring now for the moment to Fig. 6, a multi-stage amplifier circuit is disclosedv comprising a vacuum tubey repeater 17 constituting the tlrst stageoi"` amplification and two vacuum tubes 2O and 21 forming the second stage ot' amplification. Each of the tubes 17, 2O and 21 is illustrated as the threeelement tube electron discharge device. Each comprises an anode, a cathode anda control electrode. The input electrodes of the tube 17 are connected to the incoming line 16 by a transformer 22 having a primary and secondary winding. in the latter, there being connected a switch 23 for con' trolling the degree ot transformation for the i output of the transformer 22 andconsequently the output of the amplilier set. yThe output electrodes ot the tube 17 are connected by means of an intermediate transformer 24C to the input electrodes of the tubes 2O and 21, while transformer 25 serves as a coupling means between the output circuits ot' these tubes and the leads 26. Space current for the vacuum tubes is supplied from a battery 28 connected between the cathode and anode electrodes of the respective tubes. The desired static potential tor the control or grid electrodes ot thetubes supplied from a battery 27 which is yconnected between the lilament and control electrodes.. Currents for lighting the lilaments may be supplied by a batter-57,38 through terminals 29 located on the panel As shown in Figs. 4: and 5, the shape of the horn 10 is such as to form triangularshaped spaces on either side in which the apparatus constituting the amplifier 7 is` located excepting those parts which necessarily require replacement 'from time to time. In accordance with the showing oli Figs. 3 and el., the transformers 22, 24:,and 25 are mountv ed on. the front of the panel 12 (looking from the front or the cabinet) as well as the sock ets 31 for the various vacuum tubes, th'e tubular portions ot which .tit in apertures in the panel 12, and occupy the space oneither side ot the horn 10. The vacuum tubes thus projectto the rear of the panel and .consequently may be readily removed Without die a phenol fiber strip 3Q secured topancll and held in position by means oi a strap 33. ilach ot the batteries Q7 is provided with spring contact terminals arranged to be ifastened to suitable terminal clips 341.

ln the bottom oil thecabinet below the tera minal posts an aperture through which the incoming connections pass.

In the ianel l :2 and in alignment with the throat `ot the horn 10` is an aperture 2235 through `which projects a portion ot a loud speaking receiver 36 also carried by the panel` l2 and having its terminals connected to the leads Q6 (F t5). The loud speaking receiver 36 is thus .directly coupled tothe horn lll and translates the electrical )fibrations received by the ampli'iying apparatus into audible tones.

Only tivo elements ot the combination require .mechanism tor controllingtheir operation, these beingl the output switch 23 and the `filament switch Slt). To permit. the caenY control o'ii' these elements, each switch is provided with a rod 37 extending trom the associated switch through apertures in the sides of the horn, and the lattice Work 5 to the 'front ot' the cabinet. Each oi these rods Vhas `one end biiurcated tor engaging pins individual to each oi? the switches thereby making it possible to remove the panel and still attord a simple and quick method ot attaching the rods to their associated switch. To the other end ot' the rods, there is secured a suitable knob ior permitting the rotation of the rods and the operation of the switches. Associated Witlreach of the knobs .is a circular designating plate descriptive of: the particular" `t'tmction ot the switch.

`In order .to facilitate the location ofthe rods 3T With their associated switch, the bot- `tom itl ot the cabinet is made removable.

The rods may thus be guided so that the pin in` the. switch lits in the biiurcated portion ot the rod. f

` .its the amplifier set isoftentinies operated for long periods oi time, cxiicricnco has found that the vacuum tubcsproduce excessive heating. lo avoid damage to the "cabinet and apiiaratus therein which may he caused by the heatgencated by the vacuum tubes each of the doors 7M? is provided with apertures t5` to permit the `free circulation of the air to and from the vacuum tube compartment. These apertures in addition `to acting as ventilators also serve as a means for enabling the detection as to Whether the iilainents of the vacuum tubes are lighted.

From the previous description itis apparent that such a structure readily lends itself to its use with panels carrying various types et apparatus, due to the tact that the panels a re interclningeahle.

"What is claimed is:

1. In combination, a cabinet: a i'oldcd horndisposcd in said cabinet in a manner to form triangular spaces adjacent thc opposite sides of the small end ot' said horn. a removable partition in said cabinet adjacent the small end ot said horn, electriillfal operating means for said horn carried by said partition and arranged in said triangular spaces, a receiver on said partition supporting the small end oi said horn, means manuallyV operable for controlling 'the output of said operating means, said controlling means ex tending through said spaces from the front of thecabinet, and loose coupling :meanscan` ried by the operating and controlling means tor permitting the removal oi said partition and electrical operating means :from said cabinet as a unit without obstruction :from said controlling means.`

2. In` comiiiination, a cabinet, a horn mounted in said cabinet in a manner to form triingular spaces on tivo sides thereof, a rc movable partition in said cabinet, electrical operating means vfor saidlmrn mrnmtedon said partition and projecting into said trip angular spaces, a receiver on said partition supporting the small end oi said horn, coin trolling means for said operating means cour prising rods `extending through said triangular spaces in line substantially pzirallel to opposite sides ot said cabinctpand lociisc coupling means carried by said `rods and said `operating means for permitting the removal and mounting ot the partition in the cabinet as a unit.

3. In combination, a cabinet, a loud speaker horn mounted in said cabinet, a removable partition in said cabinet, a recorrer,` secured on said partition engaging the small end `portion ot said horn by `a slip-lit arrangement, amplifying devices "carried by said partition and occupying the spaces bounded by the walls oi? the cabinet and the sides of the horn, said devices being operativelyi connected to said horn, switches carried by the partition for controlling the output ot said devices, and a plurality oi control means op erable 'from the front end portion oi said `horn for actuating said switches, said control means including loose couplings coopcratingr `with the slip-lit arrangement ot the horn in the receiver for permitting the mounting or removal of said partitions and receiver from the cabinet as a unit and Withoutiolrstruo` tion from said horn and the control means.`

'In Witness whereof, Ihercunto subscribe my name this 25th clay oMay A. D., 1923.

ALBERT r. r. unison,

lill:

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